Nerodia paucimaculata, commonly known as the Concho water snake, is a species of mostly aquatic, nonvenomous snake in the family Colubridae. The species is endemic to Texas in the United States. Geographic range N. paucimaculata is found only in west-central Texas in the Colorado and Concho river systems, in Coke, Runnels, San Saba, and Tom Green Counties. Conservation status Due to its limited range, N. paucimaculata was considered a threatened species in the state of Texas. Taxonomy N. paucimaculata was originally considered to be a subspecies of the Brazos water snake, N. harteri, but was elevated to full species status by Densmore et al. in 1992. Description The Concho water snake grows to a total length (including tail) of 16 to 32 inches (41–81 cm), and looks very much like N. harteri. However, N. paucimaculata tends to be more red in color, and has no dark markings on the underside. References Further reading Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 figures. . (Nerodia paucimaculata, p. 419). Tinkle DW, Conant R (1961). "The Rediscovery of the Water Snake, Natrix harteri, in Western Texas, with the Description of a New Subspecies". Southwestern Naturalist 6 (1): 33-44. (Natrix harteri paucimaculata, new subspecies) External links Herps of Texas: Nerodia paucimaculata paucimaculata Reptiles of the United States Endemic fauna of Texas Reptiles described in 1961